Acrux Core is an open-source LLM-ops platform designed for engineering teams building on large language models. It sits between an application and model providers, offering prompt versioning, an OpenAI-compatible gateway, distributed tracing, tool catalogs, and evaluation pipelines in one control plane. Teams can update prompts and move production aliases without redeploying their application, while every LLM call is automatically recorded with span-level detail including model, tokens, latency, and cost. The platform ships TypeScript and Python SDKs, a REST API, and supports full self-hosting under the Elastic License 2.0.